TY - JOUR
T1 - Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy)
AU - Yoshii, Kenji
AU - Hiramitsu, Yusuke
AU - Okajima, Yuka
AU - Yoneda, Yasuhiro
AU - Nishihata, Yasuo
AU - Mizuki, Jun'Ichiro
AU - Nakamura, Akio
AU - Shimojo, Yutaka
AU - Ishii, Yoshinobu
AU - Morii, Yukio
AU - Ikeda, Naoshi
PY - 2010/11
Y1 - 2010/11
N2 - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
AB - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
KW - A. Oxides
KW - C. Neutron scattering
KW - D. Dielectric properties
KW - D. Magnetic properties
KW - E. EXAFS
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U2 - 10.1016/j.materresbull.2010.07.024
DO - 10.1016/j.materresbull.2010.07.024
M3 - Article
AN - SCOPUS:77957309671
VL - 45
SP - 1574
EP - 1580
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 11
ER -